Washmill.



P. E. YOUNG.

WASH MILL APPLICATION FILED JULY 23,19.

Patented May 28,1918.

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P. E. YOUNG.

WASHMILL.

APPLICATION FILED JULY 23.1917.

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CLQQMM PHILIP n. roun er raven, massacnusn'r'rs, Assmnoa 'ro 'Acusnn'nr r-nocnss comm or raw Yonx, me, A oonrom'rron or new Y I To all who'mit mag concern:

' Be it known that 'I, PHILIP tain new and useful Improvements in (ashmills, of which the following is a specification, referencebeing had to the accompanying drawings, in whichandl aim to design'a mill which will'wash rubber more rapidly than has been possible on the mills used'heretofore, by putting a sheet of rubber under tension and washing the sheet while under tension.

Beferring to the accompanying drawings, 2 and 2 are bases'which carry fixed blocks 3 and 3 respectively and also blocks 4 and l movable by screws 5 and 5. On bases 2 and 2 are frames'fi and 6, which carry fixed blocks 7 and 7 and blocks 8 and 8 movable blocks 3-.3'.

by screws 9 and'9'. are caps 10 and 10". Roll A'is mounted. in Boll B is mounted in bltmks H. Roll-C is mounted in blocks 7 7. Boll D is mounted in blobks 8-8. Beneath bases 22 are bearings 11-11, which carry shaftE. Shaft E has keyed to it a gear Gear E" meshes with gear A A, and gear A meshes with gear C keyed to roll C. Gear C is larger thangear A,

the ratio being about six to five.

On the opposite end of roll A from gear A is keyed gear A ,which meshes with gear B keyed to roll B. Likewise, on the o posite end of roll C from gear 0 is gear which meshes with gear D keyed to roll D.

Gear A is larger than gear B and gear D is larger than gear C the ratio in each case being approximately five to four. From these-gear ratios, it is apparent that all four rolls will travel at different speeds, roll B traveling faster than roll A and roll C faster than roll D, and both rolls A and faster than C and 1).

Caps 10 and 10 carry between them a E. YOUNG, of Fairhaven, Massachusetts,,have madecer= I fiow of water, as shown in Fig. IV.

.On the frames 6 and 6- keyed to roll brought up fipeciflcation of Letters Patent. I Patenmd ay 28, 191s I Application filed an as, 1917. SerialNo. 182,1.

water pipe .12, andJframes 6 and 6' carry I between them water pipes13 and 14. llhe waterpipes 12, .13 and 14 are perforated 7 throughout their length so as to direct a v By means of screws 5-5 and 9-9, the rolls are set so as tov leave an aperture of about one .quarter of an inch between rolls A and B, .and C and D. Power is applied to. the mill through the pulley E which is revolved in the direction shown in the arrow in Fig. I. This causes the; rolls to rotate. The rubber to be washdis placed in a massin the pocket above and between rolls C and D. Rotan of these rolls causes a sheet of rubber to pass down toward rolls A and B.

This sheet is caught betweenrolls A and B,

' and inasmuch as rolls A and B travel faster than-C or D, the sheet of rubber is put under tension. At the same time, the water from loosen the dirt, and the- 13 and-14,"striking the pipe 12 tends to water from pipes sheet under tension, washes the dirt from the sheet with great rapidity.

As the rubber passes down from between rolls A-and B, the operator picks up one end of the sheet and returns it to the mass above and between rolls C and D, so that a continuous sheet is formed, as shown in Fig. IV.

Inasmuch asthe rubber is fed out from between rolls A and B more rapidly than it a is fed from between rolls C and D, the sheet on the outside of the mill will tend to travel less rapidly thanxthe portion of the sheet passing through the mill, and the rubber will tend to collect beneath the mill. To overcome this clifliculty (which is a common 'fault in wash mills) I have provided the idler roll 15, which is carried on the frame 16, which in turn is pivoted on the bar 17, carried by the caps 1010'.

Before the continuous sheet is formed, the roll 15 is raised and the end of the sheet is to the pocket between the rolls C and D, as already explained. After the sheet is formed, the idler roll 15 is dropped, so that its weight holds the sheet against roll '6. Inasmuch as the-weight of roll 15 exerts only a slight pressure on the rubber, the sheet will move upward at the fullspeed ofroll C, which, experience has shown, is

erator by laying his hand on the roll 15, can

its 4 control the speed of this roll and thus control the amount of rubber that is fed between the rolls 0 and 1D.-

When the rubber is completely washed, the sheet is cut andremoved in the ordinary, well-known manner.

The screws 55 and 99 serve two purposes. They not only control the thiclnness of the'sheet that is formed in the mill, but likewise can be used to control the tension placed on the sheet between the two sets of rolls. For example, if screws 55' are moved in so that ,rolls A and B are relatively close together, and screws 9-9 are moved out so that there is a relatively large gap between rolls G and D, so much more rubber will pass between rolls 0 and D than between rolls A and B for each rotation of these rolls, that, despite the fact that rolls Aand B travel faster than rolls C and D, the rubber between these two sets of rolls will not be 'put' under any tension at all.

Conversely, if the rolls C and D are set quite c ose together, and the rolls A and B more.

widely apart, the tension will be increased.

By thus providing means for adjusting the tension of thesheet between the two sets of rolls, it is possible to have the two sets of rolls travel at substantially the same rate of speed and still keep the sheet under tension. 1 have found, however, that the relative speeds set forth in this specification are those best adapted for general practice, for with these speed ratios the tension can be adjusted from substantially zero to a point where. the sheet of rubber will be broken. It is thus apparent that the speed j ratios of the rolls may be greatly varied and that many other changes may be made in the details of constructions without departing from the spirit or my invention.

What ll claim is:

l. A mill for washing rubber and the like, comprising two pairs of rolls through which a sheet of rubber is adapted to pass successively, means for causing the rubber to passmore rapidly through the second pair than the first pair so that the rubber may be placed under tension between the two pairs menses of rolls, and means for washing the rubber while under such tension.

2. A mill for washin rubber and the like, comprising two pairs 0 rolls through which a sheet'ol rubber is adapted to pass successively, means for causing the rubber to pass more rapidly through the second pair thanthe first pair so that the rubber may be placed under tension between the two pairs of rolls, means for regulating the degree of tension, and means for washing the rubber while under such tension.

3. A mill for washin rubber and the like, I

comprising two. pairs of rolls, the first pair being adapted to sheet the rubber and the secondpair to place the sheet under tension as it passes from the first pair, and an idler roll adapted to hold the sheet after passing from the second pair of rolls against one of the rolls of the first pair to return the sheet for further washing.

'6. in a rubber mill, the combination of a pair of driven rolls adapted to sheet the rubber, and an idler roll readily movable into out of contact with the sheet formed thereby and adapted when in contact with such sheet to hold the same against one of said rolls to return. the. sheet. for further treatment, said idler roll being likewise adapted to have its speed of rotation directly under the control of the operator so that the speed with which said sheet of rubher is returned for treatment may be controlled.

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